/*
 * Copyright 2004 original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jbfilter.jsp.fcomps;

import org.apache.commons.lang.StringUtils;

/**
 * Support class for the {@code valueForNull} feature.
 * @author Marcus ADRIAN
 */
class ValueForNullSupport {
	 public static <V>  V prepareValue(V val, String valueForNull) {
		if (valueForNull == null) {
			return val;
		}
		if(valueForNull.equals(val)) {
			return null;
		}
		if (FilterComponentTag.BLANK.equals(valueForNull)) {
			if (val instanceof String && StringUtils.isBlank((String)val)) {
				return null;
			}
		}
		return val;
	}
}
